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参数资料
| 型号： | M95256-RDW3/A |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | PROM |
| 英文描述： | 32K X 8 SPI BUS SERIAL EEPROM, PDSO8 |
| 封装： | 0.169 INCH, TSSOP-8 |
| 文件页数： | 2/43页 |
| 文件大小： | 431K |
| 代理商： | M95256-RDW3/A |
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Signal description
M95256, M95256-W, M95256-R
3.6
Write Protect (W)
The main purpose of this input signal is to freeze the size of the area of memory that is
protected against Write instructions (as specified by the values in the BP1 and BP0 bits of
the Status Register).
This pin must be driven either High or Low, and must be stable during all write instructions.
3.7
Supply voltage (VCC)
3.7.1
Operating supply voltage VCC
Prior to selecting the memory and issuing instructions to it, a valid and stable VCC voltage
must be applied: this voltage must be a DC voltage within the specified [VCC(min),
supply voltage, it is recommended to decouple the VCC line with a suitable capacitor (usually
of the order of 10nF to 100nF) close to the VCC/VSS package pins.
The VCC voltage must remain stable and valid until the end of the transmission of the
instruction and, for a Write instruction, until the completion of the internal write cycle (tW).
3.7.2
Power-up conditions
When the power supply is turned on, VCC rises from VSS to VCC. During this time, the Chip
Select (S) signal is not allowed to float and must follow the VCC voltage. The S line should
therefore be connected to VCC via a suitable pull-up resistor.
In addition, the Chip Select (S) input offers a built-in safety feature, as it is both edge
sensitive and level sensitive. Practically this means that after power-up, the device cannot
become selected until a falling edge has first been detected on Chip Select (S). So the Chip
Select (S) signal must first have been High and then gone Low before the first operation can
be started.
3.7.3
Internal device reset
In order to prevent inadvertent Write operations during Power-up, a Power On Reset (POR)
circuit is included. At Power-up (continuous rise of VCC), the device will not respond to any
instruction until the VCC has reached the Power On Reset threshold voltage (this threshold
When VCC has passed the POR threshold voltage, the device is reset and in the following
state:
●
in Standby Power mode
●
deselected (at next Power-up, a falling edge is required on Chip Select (S) before any
instructions can be executed)
●
not in the Hold Condition Status Register state:
–
the Write Enable Latch (WEL) bit is reset to 0
–
the Write In Progress (WIP) bit is reset to 0.
The SRWD, BP1 and BP0 bits of the Status Register are at the same logic level as
when the device was last powered down (they are non-volatile bits).
相关PDF资料 |
PDF描述 |
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| M95256-RMN6P/A | 32K X 8 SPI BUS SERIAL EEPROM, PDSO8 |
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| M95256-RDW6TG | 32K X 8 SPI BUS SERIAL EEPROM, PDSO8 |
| MA-306-29.4912M-K0 | QUARTZ CRYSTAL RESONATOR, 29.4912 MHz |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M95256RDW3G | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:256 Kbit serial SPI bus EEPROM with high-speed clock |
| M95256-RDW3G | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:256Kbit and 128Kbit Serial SPI Bus EEPROM With High Speed Clock |
| M95256-RDW3G/A | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:256 Kbit Serial SPI bus EEPROM with high speed clock |
| M95256-RDW3G/K | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:256 Kbit serial SPI bus EEPROM with high-speed clock |
| M95256-RDW3G/V | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:256 Kbit Serial SPI bus EEPROM with high speed clock |
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